Studies of the Structure of Light Mesons and Nucleons through Exclusive Reactions

通过排他反应研究轻介子和核子的结构

• 批准号: 1714133
• 负责人: Tanja Horn
• 金额: $ 44.8万
• 依托单位: Catholic University of America
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-08-01 至 2021-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1714133&HistoricalAwards=false
• 关键词: Studies; Structure; Light; Mesons; Nucleons

Pions and kaons are the lightest subatomic particles and play a unique role in nature; our understanding of them is essential for explaining the fundamental structure of matter. This research is centered on precision measurements of pion and kaon properties that have the potential to reveal the three-dimensional structure of the nucleons, the protons and neutrons that, together with their interactions, generate nearly of the mass of the visible universe. As such, this work probes the fundamental structure of that part of the universe that we can see. This project is part of a series of experiments taking place at the Thomas Jefferson National Accelerator Laboratory. Early career scientists, graduate students, and undergraduate students play an integral part in this project, which provides them with opportunities to further develop their training and education. These include gaining experience in the design, assembly, and testing of modern instrumentation for the detection of radiation and subatomic particles and fast signal processing electronics, and in analyzing scientific data. Furthermore, learning to work in a large international scientific community will prepare early career scientists and students for the modern work environment at academic institutions, national laboratories, and industry. This program is focused on precision measurements of pion and kaon form factors and structure functions, and validation of our understanding of hard exclusive and semi-inclusive reactions towards 3D hadron imaging and potential future flavor decomposition. Form factors are the most basic quantity towards understanding transverse spatial structure. The structure functions are expected to be different for pions, kaons, and nucleons regarding sea quarks and gluons and provide basic information about the origin of mass. 3D hadron imaging allows for the extraction of correlations between quark longitudinal momentum and transverse position from the experiment using factorization theorems. To validate the meson factorization theorems and potential future flavor decomposition, one has to measure the longitudinal and transverse (L/T) separated cross sections. This project plays a central role in this effort through precision pion, and kaon L/T separated cross section measurements at the 12 GeV Jefferson Lab and development of measurements of the, to date, mostly unknown pion and kaon structure functions at a potential future Electron-Ion Collider.

亲力和ka是最轻的亚原子颗粒，在自然界中起着独特的作用。我们对它们的理解对于解释物质的基本结构至关重要。 这项研究的重点是对亲和kaon特性的精确测量，这些特性有可能揭示核子，质子和中子的三维结构，这些结构及其相互作用几乎产生了可见宇宙的质量。 因此，这项工作探讨了我们可以看到的宇宙部分的基本结构。 该项目是在托马斯·杰斐逊国家加速器实验室进行的一系列实验的一部分。早期的职业科学家，研究生和本科生在该项目中起着不可或缺的作用，这为他们提供了进一步发展培训和教育的机会。这些包括在设计，组装和测试现代仪器方面获得经验，以检测辐射和亚原子颗粒以及快速信号处理电子设备以及分析科学数据。此外，学会在大型国际科学界工作将为早期的职业科学家和学生准备学术机构，国家实验室和行业的现代工作环境。该程序的重​​点是对锥形和kaon形式和结构函数的精确测量，以及我们对3D强子成像以及潜在的未来风味分解的硬性独家和半包含反应的理解的验证。形式因素是了解横向空间结构的最基本数量。 关于海夸克和胶子的培养，昆斯和核子的结构函数将有所不同，并提供有关质量起源的基本信息。 3D强子成像允许使用分解定理从实验中提取夸克纵向动量和横向位置之间的相关性。为了验证介体分解定理和潜在的未来风味分解，必须测量纵向和横向（L/T）分离的横截面。该项目在这项工作中通过精确派发挥了核心作用，Kaon L/T分离了GEV Jefferson实验室的横截面测量值，并开发了迄今为止的测量值，迄今为止，大多数未知的TIM和KAON结构在潜在的未来电子离子碰撞器上起作用。

项目成果

Exclusive π+ electroproduction off the proton from low to high −t

独家 Ï 质子电生产从低到高 Ït

• DOI: 10.1103/physrevc.100.065204
• 发表时间: 2019
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: Basnet, S.;Huber, G. M.;Li, W. B.;Blok, H. P.;Gaskell, D.;Horn, T.;Aniol, K.;Arrington, J.;Beise, E. J.;Boeglin, W.
• 通讯作者: Boeglin, W.

Pion and kaon structure functions at an electron-ion collider

电子离子对撞机中的π介子和介子结构函数

• DOI: 10.1063/1.5040208
• 发表时间: 2018
• 期刊: AIP Conference Proceedings
• 作者: Horn, Tanja

Deeply virtual Compton scattering off the neutron

• DOI: 10.1038/s41567-019-0774-3
• 发表时间: 2020-01
• 期刊: Nature Physics
• 影响因子: 19.6
• 作者: M. Benali;C. Desnault;Malek Mazouz;Z. Ahmed;H. Albataineh;K. Allada;K. Aniol;V. Bellini;W. Boeglin

Measurements of Nonsinglet Moments of the Nucleon Structure Functions and Comparison to Predictions from Lattice QCD for Q2=4 GeV2

核子结构函数非单矩的测量以及与 Q2=4–GeV2 晶格 QCD 预测的比较

• DOI: 10.1103/physrevlett.123.022501
• 发表时间: 2019
• 期刊: Physical Review Letters
• 影响因子: 8.6
• 作者: Albayrak, I.;Mamyan, V.;Christy, M. E.;Ahmidouch, A.;Arrington, J.;Asaturyan, A.;Bodek, A.;Bosted, P.;Bradford, R.;Brash, E.
• 通讯作者: Brash, E.

AI-optimized detector design for the future Electron-Ion Collider: the dual-radiator RICH case

• DOI: 10.1088/1748-0221/15/05/p05009
• 发表时间: 2019-11
• 期刊: Journal of Instrumentation
• 影响因子: 1.3
• 作者: E. Cisbani;A. Dotto;C. Fanelli;Michael Williams;M. Alfred;F. Barbosa;L. Barion;V. Berdnikov;W. Brooks;T. Cao;M. Contalbrigo;S. Danagoulian;A. Datta;M. Demarteau;A. Denisov;M. Diefenthaler;A. Durum;D. Fields;Y. Furletova;C. Gleason;M. Grosse-Perdekamp;M. Hattawy;Xu-Gang He;H. Hecke;D. Higinbotham;T. Horn;C. Hyde;Y. Ilieva;G. Kalicy;A. Kebede;B. Kim;Ming Liu;J. McKisson;R. Mendez;P. Nadel-Turonski;I. Pegg;D. Romanov;M. Sarsour;C. Silva;J. Stevens;Xueshi Sun;S. Syed;R. Towell;Junqi Xie;Zhiwen Zhao;B. Zihlmann;C. Zorn